Satellite remote sensing reveals coastal upwelling events in the San Matías Gulf—Northern Patagonia

Pisoni, Juan Pablo; Rivas, Andrés Luján; Piola, Alberto R.

doi:10.1016/j.rse.2014.06.019

Cited by 28 publications

(19 citation statements)

References 33 publications

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“…Habitat suitability for this species peaked at relatively high levels of that variable ( Fig 7A ). Recent investigations showed that northerly and westerly winds produce upwelling events of few days over the west and north coasts of the SMG respectively [ 64 – 66 ]. These events can be observed in daily SST satellite images as zones of lower temperature than their surrounding waters and occur around 27 times a year [ 66 ].…”

Section: Discussionmentioning

confidence: 99%

“…Recent investigations showed that northerly and westerly winds produce upwelling events of few days over the west and north coasts of the SMG respectively [ 64 – 66 ]. These events can be observed in daily SST satellite images as zones of lower temperature than their surrounding waters and occur around 27 times a year [ 66 ]. Therefore, over a period of few months (such as the seasons considered here), areas of upwelling should be spatially correlated with zones of high SST variability (in our study SST-SD is an indicator of this seasonal variability).…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, over a period of few months (such as the seasons considered here), areas of upwelling should be spatially correlated with zones of high SST variability (in our study SST-SD is an indicator of this seasonal variability). Notably, upwelling events over the west coast occurred more frequently in the cold season (about 17 events per year) than in the warm season (about 10 events per year) [ 66 ]. So, this oceanographic process might be conditioning the distribution of common dolphin preys in the cold season.…”

Section: Discussionmentioning

confidence: 99%

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Environmental Niche Overlap between Common and Dusky Dolphins in North Patagonia, Argentina

et al. 2015

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Research on the ecology of sympatric dolphins has increased worldwide in recent decades. However, many dolphin associations such as that between common dolphins (Delphinus delphis) and dusky dolphins (Lagenorhynchus obscurus) are poorly understood. The present study was conducted in the San Matías Gulf (SMG) ecosystem (North Patagonia, Argentina) where a high diet overlap among both species was found. The main objective of the present work was to explore the niche overlap of common and dusky dolphins in the habitat and temporal dimensions. The specific aims were (a) to evaluate the habitat use strategies of both species through a comparison of their group attributes (social composition, size and activity), and (b) to evaluate their habitat preferences and habitat overlap through Environmental Niche modeling considering two oceanographic seasons. To accomplish these aims, we used a historic database of opportunistic and systematic records collected from 1983 to 2011. Common and dusky dolphins exhibited similar patterns of group size (from less than 10 to more than 100 individuals), activity (both species use the area to feed, nurse, and copulate), and composition (adults, juveniles, and mothers with calves were observed for both species). Also, both species were observed travelling and feeding in mixed-species groups. Specific overlap indices were higher for common dolphins than for dusky dolphins, but all indices were low, suggesting that they are mainly segregated in the habitat dimension. In the case of common dolphins, the best habitats were located in the northwest of the gulf far from the coast. In the warm season they prefer areas with temperate sea surface and in the cold season they prefer areas with relatively high variability of sea surface temperature. Meanwhile, dusky dolphins prefer areas with steep slopes close to the coast in the southwestern sector of the gulf in both seasons.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Environmental Niche Overlap between Common and Dusky Dolphins in North Patagonia, Argentina

et al. 2015

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“…As has already been mentioned, a wind-driven upwelling in the Baltic Sea may occur at any time of the year, although the thermal effects may not be noticeable when the sea waters are not thermally stratified [46], and upwelling may have no significant biological impact [52]. On the other hand, upwelling events during the warm season are of great importance and are recognized as efficient contributors to the exchange processes between the coastal and offshore waters [53].…”

Section: Upwelling Influence On the Chl-a Concentration In The Se Balmentioning

confidence: 99%

Remote Sensing of Coastal Upwelling in the South-Eastern Baltic Sea: Statistical Properties and Implications for the Coastal Environment

et al. 2018

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A detailed study of wind-induced coastal upwelling (CU) in the south-eastern Baltic Sea is presented based on an analysis of multi-mission satellite data. Analysis of moderate resolution imaging spectroradiometer (MODIS) sea surface temperature (SST) maps acquired between April and September of 2000-2015 allowed for the identification of 69 CU events. The Ekman-based upwelling index (UI) was applied to evaluate the effectiveness of the satellite measurements for upwelling detection. It was found that satellite data enable the identification of 87% of UI-based upwelling events during May-August, hence, serving as an effective tool for CU detection in the Baltic Sea under relatively cloud-free summer conditions. It was also shown that upwelling-induced SST drops, and its spatial properties are larger than previously registered. During extreme upwelling events, an SST drop might reach 14 • C, covering a total area of nearly 16,000 km 2 . The evolution of an upwelling front during such intensive events is accompanied by the generation of transverse filaments extending up to 70 km offshore. An analysis of the satellite optical data shows a clear decline in the chlorophyll-a concentration in the coastal zone and in the shallow Curonian Lagoon, where it drops down by an order of magnitude. It was also shown that a cold upwelling front alters the stratification in the atmospheric boundary layer, leading to a sudden drop of air temperature and near-surface winds.upwelling fronts also importantly modifies the vertical stratification and turbulent regime in the marine-atmosphere boundary layer (MABL), resulting in a change in the surface wind stress and direction in the coastal zone [3,9].Nutrient-rich waters brought up from deeper layers to the surface, particularly in the summer time, and the exposure of upwelled phytoplankton to surface radiation enhances the primary production and phytoplankton biomass during upwelling events [10,11], hence influencing the coastal pelagic communities and higher trophic levels [12]. Moreover, upwelling-related coastal ocean dynamics may eventually modify the spatial patterns of background algae blooms in the coastal zone by transporting them farther offshore.During the summer-time holiday season, CU might also have a negative impact on particular tourist areas as a result of a rapid drop in water and air temperatures near the shore [2]. Furthermore, bathing tourism depends on good water quality, while post-upwelling phytoplankton blooms might significantly reduce it, making coastal waters unattractive for recreation [13].The need to study coastal upwelling in the Baltic Sea is also essential in order to assess the regional variability of water and energy exchange, salinity dynamics, and the response of marine ecosystems to extreme events-some of the "Grand Challenges" of the Baltic Earth Science Plan [14], established in 2016. Thus, the upwelling phenomenon is indeed of certain interest to researchers, fishermen, and coastal managers [15]. The availability of wide spatial and temporal co...

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“…Birds from Islote Lobos fed relatively near to the colony along the western coast of the San Matías Gulf. Upwelling events that carry subsurface, nutrient-rich waters to the upper layer and frequently lead to high primary productivity are common in this area (Pisoni et al 2014) (Fig. 1).…”

Section: Discussionmentioning

confidence: 99%

Moving northward: comparison of the foraging effort of Magellanic penguins from three colonies of northern Patagonia

et al. 2015

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Satellite remote sensing reveals coastal upwelling events in the San Matías Gulf—Northern Patagonia

Cited by 28 publications

References 33 publications

Environmental Niche Overlap between Common and Dusky Dolphins in North Patagonia, Argentina

Environmental Niche Overlap between Common and Dusky Dolphins in North Patagonia, Argentina

Remote Sensing of Coastal Upwelling in the South-Eastern Baltic Sea: Statistical Properties and Implications for the Coastal Environment

Moving northward: comparison of the foraging effort of Magellanic penguins from three colonies of northern Patagonia

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